I care much less about being indexed by Google as much as you might think.

Google bot doesn't get blocked from my server primarily because it's a *very* well behaved bot. It sends a lot of requests, but it's very kind, and has never acted in a way that could overload my server. It respects robots.txt, and identifies itself multiple times.

Google bot doesn't get blocked, because it's a well behaved bot that eagerly follows the rules. I wouldn't underestimate how far that goes towards the reason it doesn't get blocked. Much more than the power gained by being google search.